To change or configure the OpenBSD package install mirror, you will need to edit the /etc/installurl file. This file contains the URL of the package install mirror that is used by the pkg_add utility to install packages.
To change the package install mirror, open the /etc/installurl file in a text editor and update the URL to the desired package mirror. For example, to use the package mirror located at http://mirror.example.com/pub/OpenBSD, you can update the /etc/installurl file as follows:
http://mirror.example.com/pub/OpenBSD
It's worth noting that the /etc/installurl file is a simple text file, with no formatting or other special characters. The file should contain only the URL of the package mirror, with no leading or trailing spaces.
After updating the /etc/installurl file, you will need to update the package lists by running the following command:
pkg_add -U
This will update the package lists and use the new package mirror to download the package information.
You can then use the pkg_add utility to install packages as normal. For example, to install the openssh package, you can run the following command:
pkg_add openssh
This will use the package mirror specified in the /etc/installurl file to download and install the openssh package.
It's worth noting that you may need to run the pkg_add command with sudo privileges if you are not logged in as the root user. For example:
sudo pkg_add openssh
This will allow you to install the openssh package with the necessary privileges.